. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. THE STUDY OP MUSCLE PHYSIOLOGY. 185. Fio. 173.—DiogrammHtic representation of the uendiilam myograph. The imoked- ^oao plate. A, swings with a pendulum, B. Before an experiment Is commenced the pendulum is raiced up to the right and kept in |>o8ition by the tooth, a, catch- ing on the spring-catch, b. On depressing the catch, b, the glass plate being set free swings Into the n
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. THE STUDY OP MUSCLE PHYSIOLOGY. 185. Fio. 173.—DiogrammHtic representation of the uendiilam myograph. The imoked- ^oao plate. A, swings with a pendulum, B. Before an experiment Is commenced the pendulum is raiced up to the right and kept in |>o8ition by the tooth, a, catch- ing on the spring-catch, b. On depressing the catch, b, the glass plate being set free swings Into the new position indicated by the dotted lines, and is held there by the tooth, a', meeting the catch, b'. In the course of its swing the tooth, a, coming into contact with the projecting steel rod, e, knocks it to one side, into the position indicated by the dotted line, c'. The rod, c, is in electric continuity with the wire, x. of the primary coil of an induction machine. In like manner the screw, d. Is in electric continnlty with the wire, y, of the same primary coil. The screw, (/, and the ro<l, c, are provldt^ with platinum points, and both are in- sulated by means of the ebonite block, e. The circuit of the primary coil to which X and V l)elong is closed as long as e and U are in contact. When In its swing the tooth, a', knocks c away from d, the circuit la immediately broken, and a "breaking" shock is sent through the electrodes connected witli the secondary coil of the machine, and so through the nerve. A lever Is brought to bear on the ftlaas plate, and when at rest descnbcs an arc of a circle of large radius. The tun- ng-fork,/(cnds only seen), serves to mark the time (after Foster). Apparatus of this kind is not usually employed much for experiments with muscle ; such an arrangement is, however, shown in Fig. 170, in which also will be seen a metronome, the pendulum of which, by dipping into cups containing mercury, makes the circuit. Such or a simple c
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